/*
 * Copyright (c) 2013-2019, Huawei Technologies Co., Ltd. All rights reserved.
 * Copyright (c) 2020, Huawei Device Co., Ltd. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 *    conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
 *    of conditions and the following disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "los_multipledlinkhead_pri.h"
#include "los_compiler.h"

#define OS_BITS_PER_BYTE 8
STATIC_INLINE UINT32 OsLog2(UINT32 size)
{
    return size ? ((sizeof(size) * OS_BITS_PER_BYTE) - CLZ(size) - 1) : 0;
}

LITE_OS_SEC_TEXT_INIT VOID OsDLnkInitMultiHead(VOID *headAddr)
{
    LosMultipleDlinkHead *head = (LosMultipleDlinkHead *)headAddr;
    LOS_DL_LIST *listHead = head->listHead;
    UINT32 idx;

    for (idx = 0; idx < OS_MULTI_DLNK_NUM; ++idx, ++listHead) {
        LOS_ListInit(listHead);
    }
}

LITE_OS_SEC_TEXT_MINOR LOS_DL_LIST *OsDLnkMultiHead(VOID *headAddr, UINT32 size)
{
    LosMultipleDlinkHead *head = (LosMultipleDlinkHead *)headAddr;
    UINT32 idx = OsLog2(size);

    if (idx > OS_MAX_MULTI_DLNK_LOG2) {
        return (LOS_DL_LIST *)NULL;
    }

    if (idx <= OS_MIN_MULTI_DLNK_LOG2) {
        idx = OS_MIN_MULTI_DLNK_LOG2;
    }

    return head->listHead + (idx - OS_MIN_MULTI_DLNK_LOG2);
}
